Nude except pants? Not anticipated (10)
I believe the answer is:
unexpected
'not anticipated' is the definition.
(something expected has been anticipated)
'nude except pants?' is the wordplay.
'pants?' indicates an anagram (UK informal term for 'nonsense' or 'rubbish').
'nude'+'except'='nudeexcept'
'nudeexcept' anagrammed gives 'UNEXPECTED'.
(Other definitions for unexpected that I've seen before include "Unforeseen" , "Not foreseen" , "Surprising" .)